I am using WindowBlinds with Crimson Editor 3.72 (Windows XP Pro, SP3) and I noticed that usually the active tab is displaying white text on bright gray background (with a lot of different skins) which makes the text unreadable. Are you using OS specific System colors, such as buttonface etc? You could resolve this by making sure you style both background and text color to connected colors such as Highlighttext and SelectedItem. You might be using Menu and Windowtext, or similar - please be aware that these can be very similar colors, so an override option might be the easiest workaround. While we are on the topic of tabs, drag and drop to reorder would be a very useful feature.

Thank you for pointing this out. 3.70 did not change the color of the active tab. One of the developers decided to do this for 3.72. I'm not sure what the reasoning was, perhaps someone was having trouble seeing which tab was active. If I recall correctly, your diagnosis of the problem is accurate. I think it is based on system colors.